Answer:
the shape of white blood cells
Sildenafil, also known as viagra, treats <span>erectile dysfunction.
</span>Isosorbide dinitrate- is used to treat or prevent angina.
They both dilate blood vessels, making it easier for blood to flow.
This drugs taken together are not recommended because it may cause blood pressure to fall
excessively, which can lead to cardiovascular collapse.
Other side effects are: dizziness, fainting,
headache, heart palpitations, and priapism (prolonged and
painful erection)
I believe It is A because fissure eruptions are common on large volcanoes and also is built up by many layers of hardened lava, tephra, pumice, and volcanic ash.
